/Engine/Source/Runtime/UMG/Public/Components/CanvasPanelSlot.h
Called by the designer to "nudge" a widget in a direction. Returns true if the nudge had any effect, false otherwise.
virtual bool NudgeByDesigner ( const FVector2D & NudgeDirection, const [TOptional](API\Runtime\Core\IO\TOptional)< int32 > & GridSnapSize )